Season the steaks on both sides with the pepper, lightly patting it on.,Set a large cast-iron skillet over moderately high heat.,Season the steaks with salt, add them to the skillet and cook until brown and crusty, about 4 minutes.,Turn and cook for 4 minutes longer for medium-rare meat.,Transfer the steaks to a platter.,Pour off the fat from the skillet, add the wine and cook until reduced by half, about 30 seconds.,Pour the sauce over the steaks.,______,Add the watercress and cook over high heat, tossing, until wilted, about 1 minute.,Season with salt.,Cut the steaks in half, transfer to plates and serve with the watercress.